Ohm law calculator
Current, voltage, resistance: calculations related to Ohm law. Enter known values (e.g. voltage and resistance of conductor) and we'll show you step-by-step how to transform basic formula and find out missing value (e.g. current)

# Beta version

BETA TEST VERSION OF THIS ITEM
This online calculator is currently under heavy development. It may or it may NOT work correctly.
You CAN try to use it. You CAN even get the proper results.
However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.
Feel free to send any ideas and comments !

# What do you want to calculate today?

 Choose a scenario that best fits your needs I know voltage (U) and resistance (R) and want to calculate current (I)I know current (I) and resistance (R) and want to calculate voltage (U)I know voltage (U) and current (I) and want to calculate resistance (R)

# Calculations data - enter values, that you know here

 Current (I) yottaampere [YA]zettaampere [ZA]exaampere [EA]petaampere [PA]teraampere [TA]gigaampere [GA]megaampere [MA]kiloampere [kA]ampere [A]deciampere [dA]centiampere [cA]miliampere [mA]microampere [µA]nanoampere [nA]pikoampere [pA]femtoampere [fA]attoampere [aA]zeptoampere [zA]yoctoampere [yA]stat (ESU) [statA]ab (EMU) [abA] => Voltage (U) yottavolt [YV]zettavolt [ZV]exavolt [EV]petavolt [PV]teravolt [TV]gigavolt [GV]megavolt [MV]kilovolt [kV]volt [V]decivolt [dV]centivolt [cV]milivolt [mV]microvolt [µV]nanovolt [nV]pikovolt [pV]femtovolt [fV]attovolt [aV]zeptovolt [zV]yoctovolt [yV]stat (ESU) [statV]ab (EMU) [abV] <= Resistance (R) yottaohm [YΩ]zettaohm [ZΩ]exaohm [EΩ]petaohm [PΩ]teraohm [TΩ]gigaohm [GΩ]megaohm [MΩ]kiloohm [kΩ]ohm [Ω]deciohm [dΩ]centiohm [cΩ]miliohm [mΩ]microohm [µΩ]nanoohm [nΩ]pikoohm [pΩ]femtoohm [fΩ]attoohm [aΩ]zeptoohm [zΩ]yoctoohm [yΩ]volt per ampere [V/A]stat (ESU) [statohm]ab (EMU) [abohm] <=

# Units normalization

 Voltage (U) Show source$230\ \left[V\right]$ Resistance (R) Show source$460\ \left[\Omega\right]$ Current (I)

# Result: Current (I)

Used formulaShow source$I = U / R$
ResultShow source$\frac{1}{2}$
Numerical resultShow source$0.5\ \left[A\right]$
Result step by step
 1 Show source$\frac{\left(230\right)}{\left(460\right)}$ Removed unneded parenthesis 2 Show source$\frac{230}{460}$ Simplified fractions 3 Show source$\frac{1}{2}$ Result
Numerical result step by step
 1 Show source$\frac{1}{2}$ Divided fraction 2 Show source$0.5$ Result
Units normalizationShow source$0.5\ \left[A\right]$

# Some facts

• The Ohm's law states that the electric current is directly proportional to the voltage (i.e. the difference of potentials between the ends of the conductor) and inversely proportional to resistance of the conductor.
• Mathematically, Ohm's law can be written in the following form:
$I = \frac{U}{R}$
where:
• For practical reasons, all conductors (and also any electric or electronic elements that may appear in the circuit) are divided into:
• linear elements - meeting Ohm's law (in given circumstances), which can be called "ohmic",
• non-linear elements - where Ohm's law doesn't apply (like diodes)
• It's important to note, that Ohm's law is stated as "for a conductor in given state", meaning that other cirumstances are intentionally ignored.
For example, the temperature change:
• if the voltage is increased, then the current will increase (by Ohm's law),
• this may potentially increase the temperature of the conductor,
• the resistivity of materials usually changes with temperature, so:
• if the material is a metal (like copper), then the resistance will increase and so will reduce the current,
• for some other materials (like germanium), the resistance will decrease and so will further increase the current,
• in summary: the voltage increase changed indirectly also the resistance - additional factor to consider. It doesn't break the Ohm's law, but introduces additional factor (resistance change when temperature changes).

# Tags and links to this website

Tags:
Tags to Polish version: